diff --git a/projects/core/src/main/resources/data/computercraft/lua/rom/apis/gps.lua b/projects/core/src/main/resources/data/computercraft/lua/rom/apis/gps.lua
index d1eafec2c..13b1f7163 100644
--- a/projects/core/src/main/resources/data/computercraft/lua/rom/apis/gps.lua
+++ b/projects/core/src/main/resources/data/computercraft/lua/rom/apis/gps.lua
@@ -148,8 +148,8 @@ function locate(_nTimeout, _bDebug)
             local sSide, sChannel, sReplyChannel, tMessage, nDistance = p1, p2, p3, p4, p5
             if sSide == sModemSide and sChannel == CHANNEL_GPS and sReplyChannel == CHANNEL_GPS and nDistance then
                 -- Received the correct message from the correct modem: use it to determine position
-                if type(tMessage) == "table" and #tMessage == 3 and tonumber(tMessage[1]) and tonumber(tMessage[2]) and tonumber(tMessage[3]) then
-                    local tFix = { vPosition = vector.new(tMessage[1], tMessage[2], tMessage[3]), nDistance = nDistance }
+                if type(tMessage) == "table" and #tMessage == 4 and tonumber(tMessage[1]) and tonumber(tMessage[2]) and tonumber(tMessage[3]) and tonumber(tMessage[4]) then
+                    local tFix = { vPosition = vector.new(tMessage[1], tMessage[2], tMessage[3]), nDistance = tMessage[4] }
                     if _bDebug then
                         print(tFix.nDistance .. " metres from " .. tostring(tFix.vPosition))
                     end